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Home >> Lexus >> 2008 >> RX 350 AWD >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 17 (Engine Control System) >> SFI System >> DTC P0171 System Too Lean (Bank 1); DTC P0172 System Too Rich (Bank 1); DTC P0174 System Too Lean (Bank 2); DTC P0175 System Too Rich (Bank 2) >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

Fuel trim: 

TYPICAL MALFUNCTION THRESHOLDS

EVAP purge-cut Executing
Either of the following conditions is met Condition 1 or 2
1. Average between short-term fuel trim and long-term fuel trim 35% or more at 80°C (176°F) of ECT
2. Average between short-term fuel trim and long-term fuel trim -35% or less at 80°C (176°F) of ECT